11. WordNet: a lexical database.

11.1. Princeton WordNet.

Nouns:
Query hyponyms of "student": what kind of student are you?
Compare hypernyms of "student" and "professor":
what's the difference?
Compare hyponyms of "professor" and "lecturer":
is WordNet US English?

Adjectives:
Compare "big", "large, "great". What are their antonyms?
Which combinations of "big/large/great sister/uncle/toe"
are collocations?